The invention discloses a belt installation tool comprising a tool body, a fixing member, an abutting part and a guiding sheet. The fixing member is arranged on the tool body. The tool box is fixed to a belt pulley through the fixing member, and directly faces one side surface of the belt pulley. The abutting part is arranged on the tool body, and the end portion of the abutting part abuts against the side surface of the tool body. The guiding sheet is arranged on the tool body, and is arranged on the outer side in the radial direction of a wheel chock of the belt pulley. During a belt installation process by the use of the belt installation tool, firstly, one end of the belt is installed on a driven wheel; secondly, the other end of the belt is installed on the guiding sheet; then the tool body is fixed to a driving wheel through the fixing member; and finally, a user rotates the driving wheel so as to gradually clamp the belt on the guiding sheet into the wheel chock. The process of installing the belt on the guiding sheet needs small force as the belt is not required to be tensioned, the tool body can rotate by the aid of other tools, the operation for the installation of the belt and the rotation of the tool body is convenient, and the installation efficiency is improved compared with the prior art.